Remember those strange "Nightcrawler" videos from Fresno? I was thinking of making an SCP based around them, with the narrative being that they're a race of creatures that migrate annually between Baja and Southern California as part of a "pilgrimage." They don't want to kill, enslave, conquer or colonize - they just want to commute.

I've never heard of those videos, but whenever you base an SCP off an existing thing, you run the risk of people getting bored of it if it's too similar, or aren't interested in it because the base concept itself is a little bland. You don't want to rely too much on the existing concept that someone else developed.

they're a race of creatures that migrate annually between Baja and Southern California as part of a "pilgrimage." They don't want to kill, enslave, conquer or colonize - they just want to commute.

I feel like we've got a few entities like this already. What will make your approach to it unique? What will these creatures look like, how will they communicate, and why do they exist to begin with? What's their origin story? Why do they migrate?